Officials are probing how a 51-year-old highway bridge came to collapse in the Italian port city of Genoa yesterday, killing at least 26 people and injuring 16 others as it sent dozens of vehicles tumbling into a heap of concrete and twisted steel.

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“They looked kind of unconscious, there was some people that were helping them and there was a red car with branches hanging out the side of it.”

Police are investigating the possibility that the brawl was an organised schoolyard fight.

Police have established three separate crime scenes. (9NEWS) ()Two people have been arrested. (9NEWS) ()

Two people have been arrested, including the female driver of the vehicle and a passenger, but no one has been charged.

“There’s a number of incidents involving people fighting which culminated in a fairly serious incident at a fast food outlet on Ranford Road and then another serious incident that occurred here behind me in Eucalyptus Boulevard in Canning Vale,” Inspector Tony Hill told journalists.

“At this stage we believed that they are linked, some of the parties are involved in a number of the incidents.”

Three separate crime scenes have been set up while police investigate.